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• W163313454 abstract "2165 Objectives Recently, additive manufacturing (AM) has been proposed as a novel technique to produce pure tungsten pinhole collimators. The AM process has now been refined and post processing is used to obtain a better definition of the apertures. Here we report on improvements in material density and accuracy of the collimators. Methods A new complex multi-lofthole collimator has been designed in Siemens NX. The collimator has a size of 70 x 48.7 x 16.8 mm; it has 20 oblique loftholes with an aperture diameter of 500 μm. The loftholes of this collimator have both an entrance and an exit opening; due to this there is a true knife edge. This collimator was produced by AM (Layerwise, Belgium). The density of the collimator has been measured. The mass was measured with a precision balance; the volume was measured by using the Archimedes suspension method. The production accuracy was verified with a GOM ATOS II Triple Scan optical scanner. The isoperimetric quotient (the circularity) and the diameter of the apertures were measured using microscopes (Nikon AZ 100M, Olympus IMT200). Results The density of the collimator is 18.56 +/- 0.08 g/cm.; this is 96.4% of pure tungsten. The mean deviation from the software CAD design is +35 μm. The maximum and minimum deviations are +180 μm and -137 μm, respectively. The mean diameter of the apertures is 509 μm (the minimum diameter is 457 μm, the maximum diameter is 542 μm). The mean isoperimetric quotient of the apertures is 0.77. Conclusions This new collimator illustrates the improvements that have been made in the field of AM of tungsten objects. The density is close to pure tungsten. The overall accuracy has been greatly improved. These improvements indicate the potential of AM for tungsten collimator production. The accuracy and the density is now sufficiently high for pinhole SPECT systems and more complex designs like cone or fanbeam may be feasible. Research Support This research is funded by the EU FP7 project SUBLIMA (Grant Agreement No. 241711), IOF-Flanders and iMinds. Roel Van Holen is funded by the Research Foundation- Flanders (FWO, Belgium) and by the Ghent University." @default.
• W163313454 created "2016-06-24" @default.
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• W163313454 date "2013-05-01" @default.
• W163313454 modified "2023-09-23" @default.
• W163313454 title "Accuracy and density of pure tungsten collimators produced by additive manufacturing" @default.
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